tapping

[billystein]

are you sure those speeds are for floaters? I dont really doubt it but I have been tapping at 400 rpm since 1987 and have never read or seen where you can go that fast with floaters. the other thing that comes to mind is having to change a 2007 spindle drive. I have heard that the new fadals were not as well built than the older ones but if i lost a spindle drive in 1 year I would be really pi$$ed


billy

[Edster]

I rigid tap on my 94 vmc15 at 1000rpm no problems. I'm not sure what the max is for that machine but 1k works fine. I also use floaters occasionally when I need an extra holder, and it works fine at 1k also.

[machinist_1]

No, on my mill I ridgid tap only. Now I do use compression holders on my Lathe. Even on it, 1500-2000 with no prblem.

[Mark @ JARD,Inc]

I have a ton of trouble with my compression holders also, my taps always break.

There again I usually am trying to tap 5-40's at 200RPM... any suggestions?
(Sorry to jack your thread)

[Delw]

Read this thread it has some very good info, look for the posts from Neal as well

[Mark @ JARD,Inc]

was there a link to the thread?

[Mark @ JARD,Inc]

oh, you mean THIS thread. Well, I read this thread in its entirety. Some good advice, but nothing really applicable to my situation.

[Delw]

You were suppose to guess... sorry thought I posted the link here you go

http://www.cnczone.com/forums/showthread.php?t=64238

[Mark @ JARD,Inc]

lol... ok. I really got confused there for a minute.

THANKS! (for the link)

[Delw]

if all your programming is correct, and your tap holder is in good shape, then I would suggest you have a tooling problem other than the machine itself. Providing you put in the correct lead to begin with.

like drill size, off center, bad drill, taps are cheap or garbage chipped, wrong tap for the job, you worked hardend the material, lubrication not good, chip build up wrong tap neck on tap is too thin, could be a bunch of things. I think 200rpms is a tad slow but dont see why it wouldnt work.
also 5-40 taps due tend to build chips up in the flutes a quality tap is a must

[fizzissist]

I'm tapping 0-80, 2-56, 4-40, 6 8 & 10-32 in SS all the time with rigid, and I start at 300rpm for the 0-80, and typically run at 6-800 rpm for the other sizes. The problems I've had are always hole prep/tap selection based, never rpm. And most of those problems are because of blind holes.

I know I could run faster, but I don't need to.

One question I've got is that in the course of re-tapping a hole, that is, tapping the holes, then coming back and tapping to finish depth by recalling the program, the machine acts like it's ignoring the G8 and doing an abrupt stop at the bottom, and abruptly starting the spindle reverse.

Tried the program that Fadal sent me (no, not you Neil, one of the other guys..) and while it did work, I'm not real comfortable with what looks to be the abrupt spindle stop/reversal.

Can I be comfortable just re-running the tapping cycle with a deeper Z and not have to worry about either breaking a tap or rethreading and ruining the threads?